In March 559, a band of Kutrigurs led by Zabergan with at least 7000 horsemen attacked Constantinople.

626

The defeat of the siege was the beginning of a series of events that would bring the Roman-Persian Wars to an end.

674-678

Arab Forces began seizing land for a blockade as early as 672.

704-705

Deposed emperor Justinian II regained the city at the head of a 15,000 strong Bulgarian-Byzantine force.

717-718

After a 20 year build up, Arab Forces organized a combined land and sea blockade of Constantinople

813

Khan Krum died over the winter of 813-814 waiting for his siege engines to arrive.

821-822

Thomas led one of the largest rebellions in Byzantine history. Michael II would call on Bulgarian assistance to finally break the siege.

860

Roughly 200 vessels attacked the suburbs of Constantinople while the Byzantine Army and Navy were occupied elsewhere.

907

The raid is most notable for the subterfuge of attaching wheels to boats to bring them directly against the walls of the city.

912

Having previously routed the entirety of the Byzantine army, Simeon encamped outside Constantinople threatening siege until the Byzantines agreed to resume tribute.

924

Simeon I returned to Constantinople, again without initiating a formal siege, and the Byzantine tribute was replaced by a formal tax paid to the Bulgarians.

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941

The Byzantines were able to devastate the Rus fleet through the use of Greek fire.

1047

Tornikios led a brief siege of the city as part of a dangerous but ultimately doomed rebellion.

1050-1051

A poorly documented siege, the attack is referenced in Armenian sources.

1203-1204

After holding off Muslim forces for hundreds of years, Constantinople's walls succumbed to Christian crusaders instead.

1235

The Bulgarian and Nicaea Empires, headed by Ivan Asen II and John III, conspired to bring down the Latin Empire of the Crusaders but were unable to enter the city.

1260

Relying on a traitor to let his troops in, Emperor Michael abandoned the siege when the traitor failed to deliver.

1261

While the troops of the Latin Empire were away, treason worked as the troops of the Nicaean's were let into the city and the Latin Empire destroyed.

1376

Having been blinded in one eye in an earlier rebellion, Andronikos successfully took Constantinople with Ottoman help, but would be overthrown within 3 years.

1411

The siege of 1411 occurred when chaos and civil war reigned in the Ottoman Empire following the defeat of Sultan Bayezid I by the Central Asian warlord Timur.

1453

Often used to mark the end of the Middle Ages, the Fall of Constantinople to the Ottoman Turks also represented the last serious attack on the ancient city from outside forces until British forces occupied the city at the end of WWI.

378

Often used to mark the end of the Middle Ages, the Fall of Constantinople to the Ottoman Turks also represented the last serious attack on the ancient city from outside forces until British forces occupied the city at the end of WWI.